D_Alex

24 ms·

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by D_Alex 8y ago
It is far cheaper to reduce the emissions of CO2 by switching to carbon free energy to a sufficient level that atmospheric CO2 stops rising (~25-50% of current level, different sources give different numbers), than to extract CO2 from the a
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by D_Alex 8y ago
That's a bit stupid, really. We can substitute many GG producing activities with carbon free electricity. Some examples: - Heat pumps for space and water heating, instead of gas, heating oil etc. Cooking on an induction stovetop instea
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by D_Alex 8y ago
Your article is interesting, but it makes a number of incorrect or misleading claims, the chief one being that heating via electricity produced by wind or PV is inefficient. On the contrary, it is cheap, uncomplicated and very efficient in
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by D_Alex 8y ago
>How many years do the laborers have left? Is it less than the medium term of raising prices to 80-100/bbl? I don't think the ageing workforce is a huge problem, if that is what you are asking. The labour pool can smoothly abso
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by D_Alex 8y ago
I would love to show you an unbiased analysis of long-term economics of individual shale wells, I have a few. But, confidentiality. I can say that: First of all the picture is quite complex, and of course not all wells are the same. Second
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by D_Alex 8y ago
> Not sure why you have so much emotional investment in this topic I can't sleep when someone is wrong on the internet!! :) Peace.
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by D_Alex 8y ago
>I work in airworthiness and maintenance, so I deal with aerostructures on a daily basis. You? I know you work in airworthiness from your post history. It also indicates you work with flight systems, and not structures. Amirite? What is
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by D_Alex 8y ago
I have a problem with every statement you made in your first reply, starting with "aerospace engineer here", which implies you are specially qualified to discuss airplane structural design. There are many disciplines in "aero
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by D_Alex 8y ago
>Yet none ever wonder or look at why cockpit windows remain decidedly rectangular. :) Don't listen to the "aerospace engineer" that answered you. The reason why cockpit windows are so angular is of course for visibility. T
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by D_Alex 8y ago
I am sure you are being humorous, but anyway, the FTC says: "When consumers see or hear an advertisement, whether it’s on the Internet, radio or television, or anywhere else, federal law says that ad must be truthful, not misleading, a
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by D_Alex 8y ago
You are right, thanks for pointing this out. I hate making mistakes like that.
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by D_Alex 8y ago
Unfortunately the volumes of "cleaned" brine are just not significant. See my comment elsewhere in the thread.
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by D_Alex 8y ago
Simple math will tell you that this increase cannot be due to desalination. Look: Volume of the Persian Gulf = Area (251,000 sq km) * average depth (50 m) = 12,000 cubic km approx. Total amount of desalinated water produced in the world, pe
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by D_Alex 8y ago
> It states "The current global solar potential technically available was estimated at about 613 PWh/y." That's 70 terawatts. So there is technically enough potential from solar alone, but it would be a tight squeeze.
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by D_Alex 8y ago
Yes, the loss is quite significant, and of course dependent on how much dust has accumulated. The effect is worse in countries near the equator, as the panels are installed with a lesser tilt. 70% losses have been reported in some studies.
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by D_Alex 8y ago
I think there are only small scale trials of technology right now, but this seems to rather simple to implement. https://en.wikipedia.org/wiki/Vehicle-to-grid has some details.
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by D_Alex 8y ago
I will just answer one of your points, because this is something I looked at recently: >On charging infrastructure I laugh: try to compute how much energy demand a single classic car, sum that for the total number of car of your nation a
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by D_Alex 8y ago
One big problem is that the production usually starts at a high rate, then declines quite rapidly - say 20-50% per year - for the remainder of the field life. If you design for the peak rate, the plant will be expensive and underutilized. I
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by D_Alex 8y ago
Simply because electric buses are the superior technology right now. Metro bus services is actually an ideal application for electric vehicles: The needed range is short, charging facilities can be in one place (depot), stop-start driving s
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by D_Alex 8y ago
Heh... The most value I got out of applying the Kelly Criterion was having the Exploration Manager for an oil and gas company admitting that he does not believe the estimates that came out of his own department (applying the Kelly Criterion
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by D_Alex 8y ago
Eh, I'll give it a go, although I realize the goalposts have not been properly fixed here. You can argue about what a "great country" is, what "theft" is and what is a "valuable resource". No country is a
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by D_Alex 8y ago
> export falling 30% year-over-year in Guangdong Export surplus is falling... that's a very different animal.
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by D_Alex 8y ago
> the embedded carbon cost of each additional vehicle is roughly equal to 10-12 years of driving that vehicle This is not really true, though you can adopt certain extreme assumptions that would support such a claim. Using statistically
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by D_Alex 8y ago
I have some comments... The article refers extensively to car sales in September 2018, and infers a "death spiral" for ICE vehicles because of a drop in sales that month. What it neglects to mention is that September's sales,
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by D_Alex 8y ago
>Never in my life, not once, have I seen citizens voting actually change anything of significance in a country Do you mean in the US? Examples that spring to mind in other countries are: gay marriage equality (Australia), independence (E
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by D_Alex 8y ago
>The housing market in Australia is very overvalued, having been inflated artificially (in part due to negative gearing ... But in Australia you cannot tax-deduct the interest on your own home, whereas in the US (IIRC) you can. I would e
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by D_Alex 8y ago
IMO, the Australian government policy on coal is a clear example of crony capitalism and does not represent the wishes of a substantial majority of the population.
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by D_Alex 8y ago
>more importantly, he is very impressed by Cody's skill to sell this unit and far wide That is a really bad reason to invest, given the stated aims of the fund.
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by D_Alex 8y ago
I absolutely agree with you - this is bad allocation of money and effort. I just cannot think of a niche where these units would actually make sense. It is a terrible idea to use these for disaster relief - never mind the cost, it would be
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by D_Alex 8y ago
Ever? Certainly. Within say 50 years? Possibly, perhaps even probably. It would seem unusual to me that a first attempt at a digital currency would survive as long as this. Consider the fate of early search engines, eg Alta Vista. The numbe

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